There are two types of steps:
a fixed number of degrees, and
a fixed distance
in kilometers.
The steps are all the same difference in latitude and longitude in terms of angular measurement. The distances traveled will vary. The path is not the shortest distance between points.
The starting direction is due east, north, west or south. However the path followed is the shortest distance. This is a great circle for a spherical earth or a geodesic for an ellipsoidal earth. The end points will vary.
For reference, 1 degree of latitude is about 110 km. You multiple this by the cosine of the latitude to get the approximate distance for 1 degree of longitude.
(For actual distances see the discussion of radii of curvature in the geodesy section.)
There is also a choice of earth models. The ellipsoid choice gives the WGS84 ellipsoid. The spherical choice gives a sphere with radius equal to the WGS84 equatorial radius.
Enter choices and values of latitude and longitude below and press compute. The answers will appear in the text box below the input.
Latitude is in degrees North and Longitude in degrees East.